BE-3251 ASSISGNMENT II

An electric current is the

• RANDOM MOVEMENT OF ELECTRONS IN A CONDUCTOR

• MOVEMENT OF FREE ELECTRONS PREDOMINATELY IN ONE DIRECTION

• PRESSURE DIFFERENCE BETWEEN TWO POLES

• THE POWER THAT CAUSES DRIFT OF ELECTRONS

The flow of electric current in a conductor is due to flow of

• ELECTRONS ONLY

• ELECTRONS AND IONS

• PROTONS

• CHARGED PARTICLES

Find the current flowing through 5Ω resistor in the given circuit.

• 0.57 A

• 0.64 A

• 0.78 A

• 0.89 A

Find the power delivered by the voltage source in the network given

• 65 watts

• 72 watts

• 63 watts

• 76 watts

Why is armature of a dc machine made of silicon steel stampings?

• To reduce hysteresis loss
  

• To reduce eddy current loss

• For the ease with which slots can be created

• To achieve high permeability

Buses, trains, trolleys, hoists, cranes make use of DC series motor because

• It provides low starting torque
  

• It provides high starting torque

• It requires minimum power compare to other motors

• Cost efficient

Which motor should not be started on no-load

• 
  DC Shunt motor
  

• Induction motor

• Synchronous motor

• DC Series motor

With increase in armature current, speed of the cumulative compound motor

• Reduces slowly compare to shunt motor
  

• Increases in proportionality with armature current

• Remains constant

• Reduces sharply compare to shunt motor

How much times reverse saturation current will increase if temperature increases 15^oC

• 2.52

• 4.62

• 4.12

• 2.82

Which of the following I-V characteristics represents a typical Si diode

• 
• 
• 
•